Well pipe elevator hinge



i'Feb. .9, 1932.. N. K. sMm-i'.

WELL PIPE ELEVATOR HINGE 2 Sheets-Sheet 1 Original Filed Dec. 7, 1929 9,1932. N. K. SMITH 1,843,992

WELL PIPE ELEVATOR HINGE Original Filed Dem-7, 1929 2 Sheets-Sheet 2Inventor Attomqys operations of Patented Feb. 9, 1932 *a i ra sr NELSONK. SMITH, or Los ANGELEs, cALIronnIA, AssIGnoR To BYnOn Acxson co,

OF LOS ANGELES, CALIFORNIA,

n CORPORATION OF DELAWARE I 1 -WELL PIPE ELEVATOR .I-IINGE 1931. SerialThis invention relates to elevators of'the type employed for raising andlowering well casing, pump tubing, and the like, in the drilling a welland maintaining the well in production after it is drilled; it relatesparticularly to a feature of construction applicable to double doorelevators comprising two doors orclamplng members, both of which arehinged toa single yoke section.

An object of the inventionis to provide in a double door elevator asimple, yeteffective, means for causing both doors to opensimultaneously through the same angle with respect to thecommon yokemember to which they are hinged. V

This application is a division of my application Serial No. 412,479,filed December 7, 1929.

In the accompanying drawings:

Figure 1 is a plan view of my elevator clamp in closed position; VFigure 2 is a horizontal section showing more clearly the mechanism forsecuring symmetrical motion of the doors;

Figure 3 is a rear elevation of the elevator; and a Figure 4 is avertical section in a plane passing through the center of the clamp;from front to rear. 1

Referring to Figure 1, my elevator comprises two main clamping membersor jaws 1, which are hinged to a rear yoke 3 by pins 14. As shown inFigure 3, the pins 14 pass through ears 16'on the jaws of the clamp andears 17 on the yoke 3. Handles 4 are formed on the front of the clampswhereby an operator can readily open or close them, and a latchmechanism, indicated generally at 5, is provided to lock the jaws inclosed position. The latch mechanism is fully described and claimed inmy original application Serial No. 412,479. Latch mechanisms ofdifferent types are wellknown in the art, and, since the particular typeemployed with the present invention is immaterial, it need not bedescribed in detail. 7 j

In a double door elevator of the type described, it is desirable thatthe two halves of 412,479. Divided and'this application 'filed June 39,No. 547,310. v I i clamp open by equal amounts'with respect to thecenter yoke 3: to which they are Tes PATENT! FFI hinged. Various meanshave been employed j in 'the past for securing this result. Oneexpedient is to provide intermeshing gears the pins 14, so that wheneverone half of the 155' '4 i I on the clamping members 1 concentric withclamp rotates with respect tolthe yoke- 3,-,it'

c uses acorresponding rotation,of the oppo-e site clamp about its axis.V 1

V In accordance with the present invention, I eliminate the necessity ofusing gears tojpro- .duce symmetrical motion between the two halves ofthe clamps by providing a floating dog '18, positioned approximately Imidway between the hinge pins' .14, thatengages with the sides ofrecesses 19 in the ears on clamps or door-1. g v 7 I Referringpart'cularly to Fig. 2 for an un derstanding of the. operatiOn-oftheinvention, it will 7 an'dfront lips 21 of: recesses 19 form openingsonly slightly wider than the thickness of the bar 18 so,that, iftheoperator opens only one door of the elevatorthe rear lip beobserved-that thefrear lips 20 on that door strikes-bar '18 and forcesit for ward until the front side of the bar strikes the front lip21 ofthe opposite recess and forces the opposite door to open simultaneouslywith the first. Similarly, if the operator; closes only one door thefront lip 21 on that door strikes the bar 18 and forces it against therear lip 20 of the opposite door, piausing it to close simultaneouslywith. the

rst. i Since the door-1 swings through a rather large arc in opening, itis necessary to make the recesses 19 wider at their innermost ends thanbetween the lips 20 and 21. Thus, as shown in Fig. 2, when the doors areOpen, the front faces of the recesses 19 lie substantially parallel toand in contact vwith the front face of bar 18. In the closed position ofthe doors the condition is reversed, since the ears 10 will have thenswung .throughan arc such that the rear faces of recesses 19 lieparallel to and in contact with the rear face of bar 18.

The top and 1,9 and of the bar 18 are plane, parallel sur bottom facesof the recesses faces and their vertical dimensions are such that thebar fits loosely; hence its position Within the'recesses is determinedsolely by forces exerted upon it by lips 20 and 21.

The hinge construction described is simple and cheap to manufacture,cannot get out of order, and effectively performs the functionofforcing. the two doors to open and close simultaneously.

I claim:

1. An elevator of the characterdescribed comprising doors provided intheir inner facescwitlr concave recesses, amember" positioned betweenand pivotally connected-With the doors, said doors being provided intheir adjacent faces adjacent to the pivots with recesses; and afloating bar'havingits oppo site ends positioned in" the" last mentionedrecesses. I

2;. An elevator of the character described comprising doorsprovided intheir inner faces with concave recesses and each pro videdwith anear; amember positioned between the doo'rs-, pivots connecting said meinherWith the ears, said ears provided intheir adjacent faces wifih recesses,and a floating bar having-its'opposite end's po'sitioned inthe lastmentioned recesses; V

31 An elevator-of thecharacter described comprising" doors provided in"their inner faces with concave recesses and each provided with an ear, amember positioned between the doors, pivots connecting said memher withthe ears; said ears provided with plain convexadja'cent faceswithrecessesin said faces, and a floatingbar having its opposite endspositioned inthe last mentioned recesses;

Signed at LOSAngeIeS; day of June, 1931 a-Ii fornia this 4th NELsoN K.SMITH;

